Create a backup file for config.ini and main.db

[rafi-d]

Following a problem in config.ini ( #7745 ) with reason - unknown, I suggest to add a new behavior:
Every time medusa starts, backup both config.ini and main.db (I suggest config.save..ini and main.save.db) .
This way, the user can manually revert to a saved copy if something bad happens to any of those.

You can also add to this behavior - a use-case where config.ini is missing (or has some error(s) ) - to auto-check if there is a saved version , and copy&use it, printing a relevant info-message to the user this has hapened.

Thanks